Lead‐Free Cs3Bi2Br9 Perovskite as Photocatalyst for Ring‐Opening Reactions of Epoxides. Issue 12 (30th May 2019)

• Record Type: Journal Article
• Authors: Dai, Yitao; Tüysüz, Harun
• Is Part Of: ChemSusChem. Volume 12:Issue 12(2019)
• Page Start: 2587
• Page End: 2592
• Publication Date: 2019-05-30
• Subjects: epoxides -- Lewis acid -- perovskites -- photocatalysis -- ring-opening reactions; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201900716
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Herein, an innovative approach was developed by using stable, lead‐free halide perovskite for solar‐driven organic synthesis. The ring‐opening reaction of epoxides was chosen as a model system for the synthesis of value‐added β‐alkoxy alcohols, which require energy‐intensive process conditions and corrosive, strong acids for conventional synthesis. The developed concept included the in situ preparation of Cs3 Bi2 Br9 and its simultaneous application as photocatalyst for epoxide alcoholysis under visible‐light irradiation in air at 293 K, with exceptional high activity and selectivity ≥86 % for β‐alkoxy alcohols and thia‐compounds. The Cs3 Bi2 Br9 photocatalyst exhibited good stability and recyclability. In contrast, the lead‐based perovskite showed a conversion rate of only 1 %. The origin of the unexpected catalytic behavior was attributed to the combination of the photocatalytic process and the presence of suitable Lewis‐acidic centers on the surface of the bismuth halide perovskite photocatalyst. Abstract : Photocatalytic ring‐opening of epoxides over halide perovskite is investigated. The lead‐free Cs3 Bi2 Br9 is prepared in situ and simultaneously used for the alcoholysis of various epoxides under visible‐light irradiation. This new catalyst shows excellent catalytic performances, good stability and recyclability. The origin of this unexpected catalytic behavior is ascribed to presence of suitable acidic centers at the halide perovskite.